The information you're talking about was conceived by two folks: manjoechan, a well-opinionated and respected member back at the old U-O.net forums, and RJ himself. Unfortunately, there seems to be no remnant left of their analyses (though I hear manjoe's still available on the jpopmusic forums and hikaruforums.net, so perhaps you can contact him there).

What I do remember from their writings (each had a somewhat different opinion) was that the "arms" holding the world in the FINAL DISTANCE represented an Egyptian god(s) or something representing death or the joining force between realms/lifeforms/etc. The two Utadas "merged" into a singular Utada, who, in traveling, brought the friends on her airship crashing into the earth. The ship, filled with flowers and the like, are then planted. Utada emerges as some sort of Mother Nature figure in SAKURA Drops.

That's what I can recall. It's a little fuzzy.